package com.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.gulimall.common.exception.NoStockException;
import com.gulimall.common.to.OrderTo;
import com.gulimall.common.to.StockDetailTo;
import com.gulimall.common.to.StockLockedTo;
import com.gulimall.common.utils.PageUtils;
import com.gulimall.common.utils.Query;
import com.gulimall.common.utils.R;
import com.gulimall.ware.dao.WareSkuDao;
import com.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.gulimall.ware.entity.WareOrderTaskEntity;
import com.gulimall.ware.entity.WareSkuEntity;
import com.gulimall.ware.feign.OrderFeignService;
import com.gulimall.ware.feign.ProductFeignService;
import com.gulimall.ware.service.WareOrderTaskDetailService;
import com.gulimall.ware.service.WareOrderTaskService;
import com.gulimall.ware.service.WareSkuService;
import com.gulimall.ware.vo.OrderItemVo;
import com.gulimall.ware.vo.OrderVo;
import com.gulimall.ware.vo.SkuHasStockVo;
import com.gulimall.ware.vo.WareSkuLockVo;
import com.rabbitmq.client.Channel;
import lombok.Data;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;


@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    private WareSkuDao wareSkuDao;

    @Autowired
    private ProductFeignService productFeignService;

    @Autowired
    private RabbitTemplate rabbitTemplate;

    @Autowired
    private WareOrderTaskService wareOrderTaskService;

    @Autowired
    private WareOrderTaskDetailService wareOrderTaskDetailService;

    @Autowired
    private OrderFeignService orderFeignService;


    private void unLockStock(Long skuId, Long wareId, Integer num, Long taskDetailId) {
        //解锁库存
        wareSkuDao.unLockStock(skuId, wareId, num);
        //更新库存工作单的状态
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(taskDetailId);
        entity.setLockStatus(2);
        wareOrderTaskDetailService.updateById(entity);
    }

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        QueryWrapper<WareSkuEntity> wrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if (!StringUtils.isEmpty(skuId)) {
            wrapper.eq("sku_id", skuId);
        }

        String wareId = (String) params.get("wareId");
        if (!StringUtils.isEmpty(wareId)) {
            wrapper.eq("ware_id", wareId);
        }

        IPage<WareSkuEntity> page = this.page(new Query<WareSkuEntity>().getPage(params), wrapper);

        return new PageUtils(page);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //判断如果还没有这个库存记录就新增
        List<WareSkuEntity> entities = this.baseMapper.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if (entities == null || entities.size() == 0) {
            WareSkuEntity wareSkuEntity = new WareSkuEntity();
            wareSkuEntity.setSkuId(skuId);
            wareSkuEntity.setWareId(wareId);
            wareSkuEntity.setStock(skuNum);
            wareSkuEntity.setStockLocked(0);
            //远程查询sku的名字
            R info = productFeignService.info(skuId);
            if (info.getCode() == 0) {
                Map<String, Object> data = (Map<String, Object>) info.get("skuInfo");
                wareSkuEntity.setSkuName((String) data.get("skuInfo"));
            }
            this.save(wareSkuEntity);
        } else {
            wareSkuDao.addStock(skuId, wareId, skuNum);
        }
    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {
        //SELECT SUM(stock-stock_locked) FROM wms_ware_sku WHERE sku_id =1;
        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVo stockVo = new SkuHasStockVo();
            Long count = baseMapper.getSkuStock(skuId);
            stockVo.setSkuId(skuId);
            stockVo.setHasStock(count != null && count > 0);
            return stockVo;
        }).collect(Collectors.toList());
        return collect;
    }

    /**
     * 为某个订单锁定库存
     * 库存解锁的场景
     * 1、下订单成功，订单过期或者没有支付，被系统自动取消、被用户手动取消
     * 2、下订单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚
     * 之前锁定的库存就要自动解锁
     *
     * @param vo
     * @return
     */
    @Override
    @Transactional//默认运行时异常都会回滚
    public Boolean orderLockStock(WareSkuLockVo vo) {
        /**
         * 保存库存工作单的详情，为了追溯库存变化
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        wareOrderTaskService.save(taskEntity);


        //1、按照下单的收货地址，找到一个就近的仓库，锁定库存
        //1、简化，找到每个商品在哪个仓库有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            //查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareIds);
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            return stock;
        }).collect(Collectors.toList());

        Boolean allLock = true;
        //2、锁定库存
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStock = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if (wareIds == null || wareIds.size() == 0) {
                //没有任何仓库有这个商品的库存
                throw new NoStockException(skuId);
            }
            //1、如果每一个商品都锁定成功，将当前商品锁定的几件工作单记录发送给mq
            //2、锁定失败，前面保存的工作单记录就会回滚，发送出去的消息，即使要解锁记录，由于去数据库查询不到id，所以就不用解锁
            //
            for (Long wareId : wareIds) {
                Long count = wareSkuDao.lockSkuStock(skuId, wareId, hasStock.getNum());
                if (count == 1) {
                    skuStock = true;
                    //TODO 告诉MQ库存锁定成功
                    WareOrderTaskDetailEntity taskDetailEntity = new WareOrderTaskDetailEntity(null, skuId, "", hasStock.getNum(), taskEntity.getId(), wareId, 1);
                    wareOrderTaskDetailService.save(taskDetailEntity);
                    StockLockedTo stockLockedTo = new StockLockedTo();
                    stockLockedTo.setId(taskEntity.getId());
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    BeanUtils.copyProperties(taskDetailEntity, stockDetailTo);
                    stockLockedTo.setDetailTo(stockDetailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange", "stock.locked", stockLockedTo);
                    break;
                } else {
                    //当前仓库锁定失败，重试下一个仓库
                }
            }

            if (!skuStock) {
                //当前商品所有仓库没有锁住
                throw new NoStockException(skuId);
            }
        }
        //3、肯定是所有商品都锁定库存成功
        return true;
    }

    @Override
    public void unlockStock(StockLockedTo to) {
        StockDetailTo detailTo = to.getDetailTo();
        Long detailId = detailTo.getId();
        //解锁
        //1、查询数据库关于这个订单的解锁库存信息
        //有：证明库存锁定成功
        //  解锁：需要判断订单情况
        //      1、没有这个订单，必须解锁
        //      2、有这个订单，需要判断订单的状态
        //          已取消：解锁库存  没取消：不能解锁
        //没有：库存锁定失败了，订单回滚了。这种情况无所解锁
        WareOrderTaskDetailEntity byId = wareOrderTaskDetailService.getById(detailId);
        if (byId != null) {
            //解锁
            Long id = to.getId();
            WareOrderTaskEntity taskEntity = wareOrderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn();//根据订单号查询订单的状态
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode() == 0) {
                OrderVo order = r.getData(new TypeReference<OrderVo>() {
                });
                if (order == null || order.getStatus() == 4) {
                    //订单不存在
                    //订单已经被取消了，才能解锁库存
                    if (byId.getLockStatus() == 1) {
                        //当前库存工作单状态为已锁定才能解锁
                        unLockStock(detailTo.getSkuId(), detailTo.getWareId(), detailTo.getSkuNum(), detailId);
                    }
                }
            } else {
                //消息拒绝以后重新放回到队列中，让别人继续解锁
                throw new RuntimeException("远程服务失败");
            }

        } else {
            //无需解锁
        }
    }

    /**
     * 防止因为订单服务卡顿，导致订单状态的消息一直改不了，库存消息优先到期了，然后去查询订单的状态，什么都不做就走了
     * 导致卡顿的订单，永远不能释放库存
     * @param orderTo
     */
    @Transactional
    @Override
    public void unlockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        //查询最新的库存工作单的状态，防止重复解锁库存
        WareOrderTaskEntity taskEntity = wareOrderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = taskEntity.getId();
        //按照库存工作单找到所有未解锁的库存，进行解锁
        List<WareOrderTaskDetailEntity> list = wareOrderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>()
                .eq("task_id", id)
                .eq("lock_status", 1));
        for (WareOrderTaskDetailEntity entity : list) {
            unLockStock(entity.getSkuId(), entity.getWareId(), entity.getSkuNum(), entity.getId());
        }

    }

    @Data
    class SkuWareHasStock {
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }

}


















